I wouldn’t consider myself an experienced HiFi enthusiast, but I usually pass when I see sellers request PayPal Friends and Family only. When you do this as a buyer, you’re losing out on all of the purchaser protections that PayPal provides - I feel like you’re really gambling at that point; regardless of the how many positive transactions the seller has had.
On the topic of gambling, from least risky to most risky: The Music Room, Audiogon, US AudioMart, Ebay - but again, not the most experienced on this site.